Juxtaposing early and late sonatas reveals just how much Leopold Koeluchs style changed over a thirty-year period. The three early sonatas from the 1770s, though harmonically modest, fizz with Rococo charm and elegance. The late sonatas meanwhile were intended for a fortepiano, which had eclipsed the harpsichord, and are twomovement works. They feature bustling rondos and deft janissary devices, one of which is the buzzing effect generated by a knee lever on the original 1815 Johann Fritz instrument used in this recording.

Metallic K.O. is a live recording by American rock band The Stooges. In its original form, the album was purported to contain the last half of a performance at the Michigan Palace in Detroit, on February 9, 1974—the band's final live performance until their reformation in 2003. The performance was notable for the level of audience hostility, with the band being constantly pelted with pieces of ice, eggs, beer bottles and jelly beans, among other things, in response to Iggy Pop's audience-baiting. Subsequent investigation of the master tapes and the May 1988 release of the double album Metallic 2X K.O. reveals that the original album contained the last half of the February 9, 1974 show, but opened with the first half of an earlier show (from October 6, 1973) at the same venue. The 2X K.O. version features the full shows from both dates.

Some contemporaries in Vienna judged the Bohemian Leopold Koželuch an even finer composer than Mozart. He was especially esteemed for his mastery of the keyboard sonata, couched in the “high-Classic” style, which are amongst the most important of their time. In this volume, the early Sonata No.37, full of beautiful simplicity, is contrasted with the Sturm und Drang vehemence of Sonata No.36. Expansive slow movements in Sonatas Nos. 34 and 35 reveal endless cantabile beauties.